Table 1.
Characteristics of infant cohorts and samples used in this study
| NS preterm (n = 13) | PS preterm (n = 8) | p-value | |
|---|---|---|---|
| Gestational age at birth, weeks | 27.49 ± 2.03 | 28.14 ± 1.54 | 0.47 |
| Probiotic exposure, weeks | 0.00 | 8.27 ± 3.19 | < 0.0001 |
| Antibiotic exposure during sample collection (types and number of infants exposed) | Amo(1), Amp(13), Az(2), Cefa(3), Cefo(5), Cefu(1), Cl(5), G(13), Mer(2), Met(1), T(1), V(5) | Amp(6), Cefa(1), Cefo(2), Cl(3), G(6), Met(2), V(1) | N/A |
| Antibiotic exposure, weeks | 1.98 ± 1.83 | 1.11 ± 1.20 | 0.20 |
| Inhospital sample, weeks in PMA (N) | 37.20 ± 3.80 (12) | 37.86 ± 1.69 (3) | 0.66 |
| Visit 1 sample, weeks in PMA (N) | 41.96 ± 2.25 (10) | 42.63 ± 1.69 (8) | 0.52 |
| Visit 2 sample, weeks in PMA (N) | 46.83 ± 1.75 (9) | 46.43 ± 0.50 (5) | 0.90 |
| Visit 3 sample, weeks in PMA (N) | 52.29 ± 2.45 (7) | 54.21 ± 1.85 (6) | 0.18 |
| Visit 4 sample, weeks in PMA (N) | 62.46 ± 2.56 (10) | 59.68 ± 0.62 (4) | 0.07 |
PMA is the postmenstrual age in weeks, and SD is the standard deviation. The data are presented as mean ± SD. P-values < 0.05 using Student’s t-test or Mann-Whitney were considered to be statistically significant